package com.cos.lession67.util;


import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

/**
 * @author: COS
 * @time: 2022/9/21 16:56
 * @description:
 */
public class MybatisUtils {
    private static SqlSessionFactory factory;
    private static final ThreadLocal<SqlSession> THREAD_LOCAL = new ThreadLocal<>();

    static {
        try {
            InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
            // 创建 sqlsessionfactory
            factory = new SqlSessionFactoryBuilder().build(is);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static <T> T getMapper(Class<T> clazz){
        SqlSession session = getSession();
        return session.getMapper(clazz);
    }


    public static SqlSession getSession() {
        SqlSession session = THREAD_LOCAL.get();
        if (session == null) {
            session = factory.openSession();
            THREAD_LOCAL.set(session);
        }
        return session;
    }

    public static void close(SqlSession session) {
        try {
            session.close();
        } finally {
            THREAD_LOCAL.remove();
        }
    }

    //银行转
    public static void commit() {
        SqlSession session = getSession();
        session.commit();
        close(session);
    }
    public static void rollback() {
        SqlSession session = getSession();
        session.rollback();
        close(session);
    }
}
